81514943 has 2 divisors, whose sum is σ = 81514944. Its totient is φ = 81514942.

The previous prime is 81514913. The next prime is 81514957. The reversal of 81514943 is 34941518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81514943 - 2⁸ = 81514687 is a prime.

It is equal to p_4752818 and since 81514943 and 4752818 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81514913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40757471 + 40757472.

It is an arithmetic number, because the mean of its divisors is an integer number (40757472).

Almost surely, 2^81514943 is an apocalyptic number.

81514943 is a deficient number, since it is larger than the sum of its proper divisors (1).

81514943 is an equidigital number, since it uses as much as digits as its factorization.

81514943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 81514943 is about 9028.5626209270. The cubic root of 81514943 is about 433.5898192958.

The spelling of 81514943 in words is "eighty-one million, five hundred fourteen thousand, nine hundred forty-three".